Safari Messing With My Game

I have a favorite game I play on my Mac and iPad. I can play it either in Facebook or on the games website. Since the last update to OS 12.6, Safari refuses to open the game in either place correctly. What I get either in Facebook or on the game webpage is squashed flat (see screen shot). If I want to access the game, I have to go to Chrome (which I hate). I've tried deleting the bookmarks, emptying cookies and cache, but the problem persists. I'd love to sort this out and go back to using just Safari. Any ideas?